More than 20 states face rain forecasts this Halloween weekend as a southward jet stream pulls a tropical atmospheric river originating near Hawaii toward California and the Southwest, threatening flash floods and disrupting festivities.
Trick-or-treaters across parts of California, the Southwest, the Deep South, the Gulf Coast, and Florida face potential washouts as weather patterns bring rain through Halloween. While the Northeast enjoys clear skies and seasonable temperatures, other regions contend with high moisture levels and severe weather threats.
Atmospheric River and Flash Flood Risks in California and the Southwest
An atmospheric river carrying tropical moisture from near Hawaii—commonly nicknamed the pineapple express
—is fueling heavy rain across the Desert Southwest and Southern California over the holiday weekend. According to the National Weather Service, atmospheric river events often drive heavy precipitation in the West, particularly during stronger El Niño winters.
Meteorologists note that while this particular system is not an exceptionally strong version of an atmospheric river, the atmospheric moisture feeding the rainfall could reach record-breaking levels for late October. The National Weather Service reports that total atmospheric moisture over parts of Arizona, Colorado, Nevada, and Utah could climb to two to three times the late-October average.
This incoming moisture arrives just over a week after destructive flooding struck parts of Arizona, Nevada, New Mexico, and Utah. Soils remain saturated from the 2 to 5 inches of rain that soaked the region last week, heightening current flash flood risks. A broad Level 1 out of 4 flash flood risk covers the region, while Central Arizona and Phoenix sit under a Level 2 flood threat through Halloween night. Flagstaff, Arizona, Zion National Park in Utah, and pockets of northern New Mexico and southern Colorado anticipate the heaviest rainfall rates. High mountain elevations in the Rockies and Sierra could also see accumulating snow, creating slippery travel conditions on mountain passes from Sunday into Monday.
Historic Rain Prospects and Coastal High Tides in Southern California
Southern California communities are tracking what could become the region’s first rainy Halloween in over a decade. Forecasters indicate a 90% chance of rain between Friday and November 2, with steady to heavy downpours likely to impact holiday events.
It looks like it will be a wet Halloween holiday weekend.
Rich Thompson, National Weather Service meteorologist in Oxnard
Thompson noted that Los Angeles and San Diego rarely see measurable precipitation on the holiday. The last recorded Halloween rainfall in downtown Los Angeles occurred in 2014 with a quarter of an inch, preceded by 2003 and 1987. San Diego has recorded measurable rain on only nine Halloweens since 1850, with 1987 marking the most recent occurrence.
Beyond the rain, the California coastline is confronting severe water hazards from historically high tides. Coastal flood warnings and advisories remain in effect through Thursday, driven by water levels expected to peak several feet above normal high tides. Areas already battered by recent storms—including the Long Beach Peninsula, threatened coastal railways in Orange County, and local piers—face inundation, road closures, and shoreline erosion during morning high tides reaching 7.5 to 8 feet or higher above baseline.
Regional Forecasts Across Texas, Florida, the Midwest, and Minnesota
In Houston, outdoor events like Scream on the Green, Boo on the Boardwalk in Kemah, and the Wings Over Houston Airshow are navigating scattered shower chances. Atmospheric moisture peaks on Saturday with hit-or-miss showers and thunderstorms, though precipitation is expected to wane by Saturday evening in time for trick-or-treating, before a stronger cold front arrives Tuesday. Meanwhile, highs reaching the mid-80s put Houston close to its all-time record warmest Halloween of 88° set in 2004.
Across Central Florida and Orlando, gusty onshore winds up to 25 mph and trapped low-level moisture keep a 30% chance of fast-moving Atlantic showers in place, though most evening trick-or-treating remains dry. However, a significant surge of tropical moisture will drive rain chances up to 80% on Sunday and Monday, bringing widespread downpours and potential localized street flooding. Small Craft Advisories and Coastal Flood Advisories remain posted along the Atlantic coast due to 6- to 9-foot offshore seas, beach erosion, and a high rip current risk.
In the Midwest, temperatures run 10 to 20 degrees above average, with highs in the 70s and lower 80s. Indianapolis approaches its record of 27 days reaching 70 degrees or greater in a calendar year. Further north, the Twin Cities in Minnesota anticipate cloud cover and scattered, hit-or-miss showers. According to the Minnesota Department of Natural Resources State Climatology Office, measurable precipitation occurs on Halloween in the Twin Cities only about 27 percent of the time, though the past three Halloweens (2023 to 2025) all recorded precipitation following the wet Halloween in 2024.
Time Change Reminders and Election Day Weather Outlook
As weekend festivities conclude, residents across the United States will set their clocks back one hour as daylight saving time ends early Sunday morning at 2 a.m., returning the local time to 1 a.m. and shifting daylight hours earlier.
Looking ahead past the weekend’s storms, meteorologists are already tracking a strong cold front scheduled to sweep across the country by Tuesday, bringing a renewed threat of strong thunderstorms and sharp temperature drops to the 50s and 70s in time for Election Day.
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